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CN107404342A - A kind of descending multiple antennas method for precoding and system - Google Patents

A kind of descending multiple antennas method for precoding and system Download PDF

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Publication number
CN107404342A
CN107404342A CN201610333129.3A CN201610333129A CN107404342A CN 107404342 A CN107404342 A CN 107404342A CN 201610333129 A CN201610333129 A CN 201610333129A CN 107404342 A CN107404342 A CN 107404342A
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CN
China
Prior art keywords
information
precoding
prelists
code collection
reported
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CN201610333129.3A
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Chinese (zh)
Inventor
刘兵朝
孙鹏
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Beijing Xinwei Telecom Technology Inc
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Beijing Xinwei Telecom Technology Inc
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Priority to CN201610333129.3A priority Critical patent/CN107404342A/en
Publication of CN107404342A publication Critical patent/CN107404342A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a kind of descending multiple antennas method for precoding and system.This method, including：Mobile context configuration UE's reports information according to residing for UE；One group of code collection that prelists of information structuring is reported according to described；The pre-coding matrix that the precoding concentration is recycled according to PRB carries out precoding to PDSCH data；Precoding is carried out to DMRS sequences according to the pre-coding matrix on current PRB.The present invention gives different open loops or the precoding of semi-loop for different mobile contexts, and employ the precoding mode based on DMRS, the transmission of higher can not only be supported, improve transmission rate, and more accurate and finer precoding can be supported, it further enhancing the performance of open loop transmission system.

Description

A kind of descending multiple antennas method for precoding and system
Technical field
The present invention relates to communication technical field, more particularly to a kind of descending multiple antennas method for precoding and system.
Background technology
LTE introduces two kinds of open-loop transmission schemes in the versions of Release 8, is space frequency block coding (Space respectively Frequency Block Coding, SFBC) and long time delay Cyclic Delay Diversity coding (Large Delay Cyclc Delay Diversity, LD-CDD).Wherein SFBC belongs to a kind of hair diversity scheme, can only improve the error performance of unique user, nothing Method improves the handling capacity of user and system.LD-CDD has then been artificially introduced time delay by circulation delay matrix between different antennae So as to obtain higher frequency diversity gain.Simultaneously LD-CDD schemes allow multilayer transmission, therefore can improve user and The handling capacity of system.
3GPP channel state information reference signals of wave beam forming defined in LTE Realease 13 (Beamformed Channel State Information Reference Signal, BF CSI-RS), and introduce The CSI of Class B types reports pattern to support full dimension to enter to have more (Full Dimension Multiple more Input Multiple Output, FD-MIMO) transmission.When base station is configured to Class B (K>1) type on give the correct time, base station Can be that a UE configures K CSI-RS in a CSI process.UE by being measured to K CSI-RS, except Being capable of reporting channel quality instruction (Channel Quality Index, CQI), order instruction (Rank Index, RI) and precoding Outside matrix instruction (Precoding Matrix Index, PMI), while CRI (CSI-RS Index) information can also be reported. Each CSI-RS in Class B is by wave beam forming, and different CRI represents different CSI-RS covering models Enclose.The CRI information that base station reports according to UE, you can prelisted with carrying out finer MIMO in corresponding CSI-RS coverages Code.
But the SFBC in LTE and LTE-A is only a kind of hair diversity scheme, is merely capable of providing diversity gain, is improved single The error performance of user.Although LD-CDD can support multilayer transmission, the transmission rate of user and system is improved, due to It is to be designed based on cell reference signals (Cell Reference Signal, CRS), the precoding of non-code book can not be supported, limits The flexibility of precoding is made, while maximum can only support 4 layers of transmission.
The content of the invention
The invention provides a kind of descending multiple antennas method for precoding and system, difference is given for different mobile contexts The method of precoding, the flexibility of precoding is enhanced, the precoding mode based on DMRS, the biography of higher can not only be supported It is defeated, and finer precoding can be carried out, enhance systematic function.
To realize above-mentioned design, the present invention uses following technical scheme：
On the one hand, there is provided a kind of descending multiple antennas method for precoding, this method, including：
Mobile context configuration UE's reports information according to residing for UE；
One group of code collection that prelists of information structuring is reported according to described；
The pre-coding matrix that the precoding concentration is recycled according to PRB carries out precoding to PDSCH data；According to work as Pre-coding matrix on preceding PRB carries out precoding to DMRS sequences.
Preferably：
The mobile context according to residing for UE configures the UE information that reports, including：If UE is in middle low speed mobile context, match somebody with somebody Put UE while report CQI information, CRI information, broadband PMI information and RI information, do not feed back subband PMI information；
One group of code collection that prelists of information structuring is reported described in the basis, including：The CRI information that is reported according to UE, broadband PMI One group of code collection that prelists of information and RI information structurings.
Preferably：
The mobile context according to residing for UE configures the UE information that reports, including：If UE is in high speed mobile context, match somebody with somebody Put UE and report CQI information, CRI information and RI information, do not feed back PMI information；
One group of code collection that prelists of information structuring is reported described in the basis, including：According to the UE CRI information reported and RI information Construct one group of code collection that prelists.
Preferably：
The mobile context according to residing for UE configures the UE information that reports, including：If UE is in the height along radius of society Fast mobile context, configuration UE report CQI information and RI information；
One group of code collection that prelists of information structuring is reported described in the basis, including：The RI information reported according to UE is each CRI One group of code collection that prelists of information configuration.
Preferably, one group of the CRI information reported according to UE, broadband PMI information and RI information structurings code collection that prelists, bag Include：
When base station configuration UE uses Release 12 8 antenna codebook, definitionN=0,1,2,3, represent not The phase adjustment factor between same polarization directional aerial；Define vm=[1 ej2πm/32 ej4πm/32 ej6πm/32], m=0,1, 2nd ..., 31, represent 32 basic precoding vectors；
As RI=1, the parameter in the broadband PMI information that UE is reported is i1, contain up to following 16 available One pre-coding matrix：
The translational speed of mobile context and UE of the base station according to residing for UE, according to presetting principle from the first precoding square Some pre-coding matrixes are selected to form the code collection that prelists in battle array；Or
As RI=2, the parameter in the broadband PMI information that UE is reported is i1, contain up to following 16 available second Pre-coding matrix：
The translational speed of mobile context and UE of the base station according to residing for UE, according to presetting principle from the second precoding square Some pre-coding matrixes are selected to form the code collection that prelists in battle array；
Wherein W represents pre-coding matrix；G represents same beam selection, the precoding group of out of phase Dynamic gene.
Preferably, one group of code collection that prelists of the CRI information reported according to UE and RI information structurings, including：
When base station configuration UE uses 8 antenna codebook in Release 12,
If RI=1, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,OrOrOr
If RI=2, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,OrOr
Wherein, W represents pre-coding matrix.
Preferably：
The RI information reported according to UE is each one group of code collection that prelists of CRI information configurations, including：
According to mobile context residing for UE and antenna configuration, a CSI for including K CSI-RS is configured for each UE Process, it is corresponding to include K CRI information, and precoding corresponding to each CRI information is concentrated and includes N number of precoding；
In the resource dispatched for the UE, the code collection that prelisted corresponding to K CRI is used according to by subframe in time domain；
The construction of the code collection that prelists in each CRI, including：
When base station configuration UE uses 8 antenna codebook in Release 12,
If RI=1, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,OrOr Or
If RI=2, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,Or Or
Wherein, W represents pre-coding matrix.
Preferably, the pre-coding matrix that the precoding concentration is recycled according to PRB is carried out in advance to PDSCH data The mode of coding, including：The CDD precodings of random wave bundle waveform or wave beam forming；
The random wave bundle figuration, including：The precoding is concentrated according to PRB circulations on the PRB dispatched for UE The data vector of pre-coding matrix and layer mapping output is multiplied precoding of the completion to PDSCH data；
The CDD precodings of the wave beam forming, including：
A1, the data symbol after being mapped according to the RI that UE is reported modulation carry out layer mapping；
A2, with l × l DFT unitary matrice UlData vector after being mapped with layer is multiplied, and the number of plies is l DFT tenth of the twelve Earthly Branches squares Battle array UlExpression formula it is as follows, l be equal to reporting of user RI:
A3, utilize a l × l diagonal circulation delay matrix DlIt is multiplied with the data vector of step a2 outputs, circulation is prolonged When matrix DlExpression formula be：
Wherein, i=0,1 ..., M-1, M represent the data symbol number transmitted on each antenna port；
A4, the data vector that the pre-coding matrix concentrated according to PRB recycling precodings exports with step a3 are mutually multiplied The precoding of paired PDSCH data.
Preferably, the pre-coding matrix on the current PRB of the basis carries out precoding to DMRS sequences, including：
The RI information reported according to UE, DMRS port is selected, generate the reference signal sequence of corresponding ports；
The reference signal sequence of each DMRS port is multiplied by the pre-coding matrix on current PRB respectively.
On the other hand, there is provided a kind of descending multiple antennas pre-coding system, the system, including：
Information collocation module is reported, information is reported for the mobile context configuration UE according to residing for UE；
The code collection that prelists constructing module, for reporting one group of code collection that prelists of information structuring according to；
Precoding module, the pre-coding matrix for recycling the precoding concentration according to PRB enter to PDSCH data Row precoding；Precoding is carried out to DMRS sequences according to the pre-coding matrix on current PRB.
Preferably：
Described to report information collocation module to be specifically used for, if UE is in middle low speed mobile context, configuration UE reports CQI simultaneously Information, CRI information, broadband PMI information and RI information, do not feed back subband PMI information；
The code collection constructing module that prelists is specifically used for, CRI information, broadband PMI information and the RI information reported according to UE Construct one group of code collection that prelists.
Preferably：
Described to report information collocation module to be specifically used for, if UE is in high speed mobile context, configuration UE reports CQI to believe Breath, CRI information and RI information, do not feed back PMI information；
The code collection constructing module that prelists is specifically used for, and one group of the CRI information and RI information structurings reported according to UE prelists Code collection.
Preferably：
It is described to report information collocation module to be specifically used for, if UE is in the high-speed mobile scene along radius of society, configuration UE reports CQI information and RI information；
The code collection constructing module that prelists is specifically used for, and the RI information reported according to UE is each one group of CRI information configurations Prelist code collection.
Preferably, the code collection constructing module that prelists, is specifically used for：
When base station configuration UE uses Release 12 8 antenna codebook, definitionN=0,1,2,3, represent not The phase adjustment factor between same polarization directional aerial；Define vm=[1 ej2πm/32 ej4πm/32 ej6πm/32], m=0,1,2 ..., 31, represent 32 basic precoding vectors；
As RI=1, the parameter in the broadband PMI information that UE is reported is i1, contain up to following 16 available One pre-coding matrix：
The translational speed of mobile context and UE according to residing for UE, according to presetting principle from first pre-coding matrix Some pre-coding matrixes are selected to form the code collection that prelists；Or
As RI=2, the parameter in the broadband PMI information that UE is reported is i1, contain up to following 16 available second Pre-coding matrix：
The translational speed of mobile context and UE according to residing for UE, according to presetting principle from second pre-coding matrix Some pre-coding matrixes are selected to form the code collection that prelists；
Wherein W represents pre-coding matrix；G represents same beam selection, the precoding group of out of phase Dynamic gene.
Preferably, the code collection constructing module that prelists, is specifically used for：
When base station configuration UE uses 8 antenna codebook in Release 12,
If RI=1, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,OrOr Or
If RI=2, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,OrOr
Wherein, W represents pre-coding matrix.
Preferably：
The code collection constructing module that prelists, is specifically used for：
According to mobile context residing for UE and antenna configuration, a CSI for including K CSI-RS is configured for each UE Process, it is corresponding to include K CRI information, and precoding corresponding to each CRI information is concentrated and includes N number of precoding；
In the resource dispatched for the UE, the code collection that prelisted corresponding to K CRI information is used according to by subframe in time domain；
The construction of the code collection that prelists in each CRI, including：
When base station configuration UE uses 8 antenna codebook in Release 12,
If RI=1, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,OrOr Or
If RI=2, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,OrOr
Wherein, W represents pre-coding matrix.
Preferably, the precoding module recycles the pre-coding matrix of the precoding concentration to PDSCH according to PRB Data carry out the mode of precoding, including：The CDD precodings of random wave bundle waveform or wave beam forming；
The random wave bundle figuration, including：The precoding is concentrated according to PRB circulations on the PRB dispatched for UE The data vector of pre-coding matrix and layer mapping output is multiplied precoding of the completion to PDSCH data；
The CDD precodings of the wave beam forming, including：
A1, the data symbol after being mapped according to the RI that UE is reported modulation carry out layer mapping；
A2, with l × l DFT unitary matrice UlData vector after being mapped with layer is multiplied, and the number of plies is l DFT tenth of the twelve Earthly Branches squares Battle array UlExpression formula it is as follows, l be equal to reporting of user RI：
A3, utilize a l × l diagonal circulation delay matrix DlIt is multiplied with the data vector of step a2 outputs, circulation is prolonged When matrix DlExpression formula be：
Wherein, i=0,1 ..., M-1, M represent the data symbol number transmitted on each antenna port；
A4, the data vector that the pre-coding matrix concentrated according to PRB recycling precodings exports with step a3 are mutually multiplied The precoding of paired PDSCH data.
Preferably, the pre-coding matrix on the current PRB of the basis carries out precoding to DMRS sequences, including：
The RI information reported according to UE, DMRS port is selected, generate the reference signal sequence of corresponding ports；
The reference signal sequence of each DMRS port is multiplied by the pre-coding matrix on current PRB respectively.
Compared with prior art, beneficial effects of the present invention are：Present invention mobile context according to residing for UE configures the upper of UE Notify breath；One group of code collection that prelists of information structuring is reported according to described；The precoding of the precoding concentration is recycled according to PRB Matrix carries out precoding to PDSCH data；Precoding is carried out to DMRS sequences according to the pre-coding matrix on current PRB.This hair It is bright to give the method for precoding of different open loops or semi-loop for different mobile contexts, and DMRS sequences have been carried out pre- Coding, the transmission of higher can not only be supported, improve transmission rate, and more accurate and finer prelist can be supported Code, further enhancing the performance of open loop transmission system.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, institute in being described below to the embodiment of the present invention The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention Example, for those of ordinary skill in the art, on the premise of not paying creative work, it can also be implemented according to the present invention The content of example and these accompanying drawings obtain other accompanying drawings.
Fig. 1 is a kind of first embodiment of the descending multiple antennas method for precoding provided in the specific embodiment of the invention Method flow diagram.
Fig. 2 is a kind of second embodiment of the descending multiple antennas method for precoding provided in the specific embodiment of the invention Method flow diagram.
Fig. 3 is a kind of structure of the embodiment of the descending multiple antennas pre-coding system provided in the specific embodiment of the invention Block diagram.
Embodiment
For make present invention solves the technical problem that, the technical scheme that uses and the technique effect that reaches it is clearer, below The technical scheme of the embodiment of the present invention will be described in further detail with reference to accompanying drawing, it is clear that described embodiment is only It is part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those skilled in the art exist The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Fig. 1 is refer to, it is the of a kind of descending multiple antennas method for precoding provided in the specific embodiment of the invention The method flow diagram of one embodiment.As illustrated, this method, including：
Step S101：Mobile context configuration UE's reports information according to residing for UE.
The mobile context includes：Middle low speed mobile context, high speed mobile context and the high speed shifting along radius of society Dynamic scene.It is more than or equal to 30Km/h when UE (User Equipment, user terminal) translational speed is in, during less than 60Km/h, UE is in middle low speed mobile context；It is more than or equal to 60Km/h when UE translational speeds are in, during less than 120Km/h, UE is in middle height Fast mobile context；When UE translational speeds, which are in, is more than or equal to 120Km/h, UE is in along the high-speed mobile field of radius of society Scape.Middle low speed mobile context, high speed mobile context and along the speed envelope between the high-speed mobile scene of radius of society It can be defined according to actual conditions.
Different mobile contexts, UE's reports information different.
Step S102：One group of code collection that prelists of information structuring is reported according to described.
Report the available code collection that prelists of one group of information structuring, because different mobile contexts, notified on UE according to UE Breath is different, then the code collection that prelists constructed also can be different.
Step S103：Prelisted according to described in PRB (Physical Resource Block, Physical Resource Block) recyclings Pre-coding matrix in code collection is to PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel) Data carry out precoding；According to the pre-coding matrix on current PRB to DMRS (De Modulation Reference Signal, demodulated reference signal) sequence progress precoding.
To first carrying out resource allocation by the PDSCH data after precoding, OFDM (Orthogonal are carried out again afterwards Frequency Division Multiplexing, orthogonal frequency division multiplexi) modulation, finally passed through according to the precoding Corresponding antenna port goes out PDSCH transmission.
When UE is in high-speed mobile scene, due to the influence of Doppler, PMI information that UE is reported exactly and can not be worked as Preceding channel is matched, if directly using pre-coding matrix corresponding to PMI to carry out precoding, will necessarily reduce systematic function.Cause This reports information according to mobile context configuration UE's, the available code collection that prelists of one group of information structuring is reported according to described, according to PRB Recycle the pre-coding matrix that the precoding is concentrated and precoding is carried out to PDSCH data, and according to prelisting on current PRB Code matrix carries out precoding to DMRS sequences, is given for different mobile contexts and different report information and corresponding prelist Code method, enhances the flexibility of precoding, enhances systematic function.
In summary, the present embodiment is directed to the method that different mobile contexts give different precodings, enhances precoding Flexibility, precoding has been carried out to PDSCH data according to the pre-coding matrix that the precoding is concentrated, and according to current PRB On pre-coding matrix to DMRS sequences carry out precoding, the transmission of higher can not only be supported, and can carry out more Fine precoding, enhances systematic function.
Fig. 2 is refer to, it is the of a kind of descending multiple antennas method for precoding provided in the specific embodiment of the invention The method flow diagram of two embodiments.As illustrated, this method, including：
Step S201：If UE is in middle low speed mobile context, configuration UE reports CQI information, CRI information, broadband PMI simultaneously Information and RI information, do not feed back subband PMI information.Base station can also set longer PMI feedback cycles.
Step S202：One group of CRI information, broadband PMI information and RI the information structurings code collection that prelists reported according to UE.
The CRI information reported according to UE, broadband PMI information and the available code collection that prelists of one group of RI information structurings, bag Include：
When base station configuration UE uses Release 12 8 antenna codebook, definitionN=0,1,2,3, represent not The phase adjustment factor between same polarization directional aerial；Define vm=[1 ej2πm/32 ej4πm/32 ej6πm/32], m=0,1,2 ..., 31, represent 32 basic precoding vectors；
As RI=1, the parameter in the broadband PMI information that UE is reported is i1, contain up to following 16 available One pre-coding matrix：
The translational speed of mobile context and UE of the base station according to residing for UE, according to presetting principle from the first precoding square Some pre-coding matrixes are selected to form the code collection that prelists in battle array；Or
As RI=2, the parameter in the broadband PMI information that UE is reported is i1, contain up to following 16 available second Pre-coding matrix：
The translational speed of mobile context and UE of the base station according to residing for UE, according to presetting principle from the second precoding square Some pre-coding matrixes are selected to form the code collection that prelists in battle array；
Wherein W represents pre-coding matrix；G represents same beam selection, the precoding group of out of phase Dynamic gene.
Similarly, when RI is other numerical value, according to the parameter in the broadband PMI information, obtain to use corresponding to it The second pre-coding matrix, the translational speed of mobile context and UE of the base station according to residing for UE is corresponding from it according to presetting principle Available second pre-coding matrix in select some pre-coding matrixes composition to prelist code collection.
Step S203：If UE is in high speed mobile context, configuration UE reports CQI information, CRI information and RI information, no Feed back PMI information.
Step S204：The one group of code collection that prelists of CRI information and RI information structurings reported according to UE.
The available code collection that prelists of one group of the CRI information reported according to UE and RI information structurings, including：
When base station configuration UE uses 8 antenna codebook in Release 12,
If RI=1, from 8 antenna codebook select 8 standards DFT (Discrete Fourier Transform, Discrete Fourier transform) pre-coding matrix composition prelists code collection, i.e.,OrOrOr
If RI=2, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,OrOr
Wherein, W represents pre-coding matrix.
Similarly, when RI is other numerical value, the DFT pre-coding matrix groups of 8 standards are selected from 8 antenna codebook Into the corresponding code collection that prelists.As RI=1, if system bandwidth is smaller, such as 1.4MHz situation, can be from the DFT of 8 standards Interval 4 conducts of selection prelist code collection in pre-coding matrix, such asOr
Step S205：If UE is in the high-speed mobile scene along radius of society, configuration UE reports CQI information and RI to believe Breath.PMI information and CRI information are not fed back.
Step S206：The RI information reported according to UE is each one group of code collection that prelists of CRI information configurations.
The RI information reported according to UE is each available code collection that prelists of one group of CRI information configurations, including：
According to mobile context residing for UE and antenna configuration, a CSI for including K CSI-RS is configured for each UE Process, it is corresponding to include K CRI information, and precoding corresponding to each CRI information is concentrated and includes N number of precoding；
In the resource dispatched for the UE, the code collection that prelisted corresponding to K CRI is used according to by subframe in time domain.
The precoding that base station can be concentrated in frequency-domain circular using precoding corresponding to each CRI, and in time domain cyclic then Use the code collection that prelisted corresponding to different CRI.
The construction of the code collection that prelists in each CRI, including：
When base station configuration UE uses 8 antenna codebook in Release 12,
If RI=1, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,OrOr Or
If RI=2, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,Or Or
Wherein, W represents pre-coding matrix.
Similarly, when RI is other numerical value, the DFT pre-coding matrix groups of 8 standards are selected from 8 antenna codebook Into the corresponding code collection that prelists.As RI=1, if system bandwidth is smaller, such as 1.4MHz situation, can be from the DFT of 8 standards Interval 4 conducts of selection prelist code collection in pre-coding matrix, such asOr
Preferably, step S201, step S203 and step S205 is logical relation arranged side by side, the mobile context according to residing for UE Selection performs corresponding step.After execution of step S202, step S204 or step S206, continue executing with step S207 or Step S208.
Step S207：The pre-coding matrix that the precoding concentration is recycled according to PRB prelists to PDSCH data Code.
The pre-coding matrix that the precoding concentration is recycled according to PRB carries out precoding to PDSCH data Mode, including：The CDD precodings of random wave bundle waveform or wave beam forming.
The random wave bundle figuration, including：The precoding is concentrated according to PRB circulations on the PRB dispatched for UE The data vector of pre-coding matrix and layer mapping output is multiplied precoding of the completion to PDSCH data.
The CDD precodings of the wave beam forming, including：
A1, the data symbol after being mapped according to the RI that UE is reported modulation carry out layer mapping；
A2, with l × l DFT unitary matrice UlData vector after being mapped with layer is multiplied, and the number of plies is l DFT tenth of the twelve Earthly Branches squares Battle array UlExpression formula it is as follows, l be equal to reporting of user RI:
A3, utilize a l × l diagonal circulation delay matrix DlIt is multiplied with the data vector of step a2 outputs, circulation is prolonged When matrix DlExpression formula be：
Wherein, i=0,1 ..., M-1, M represent the data symbol number transmitted on each antenna port；
A4, the data vector that the pre-coding matrix concentrated according to PRB recycling precodings exports with step a3 are mutually multiplied The precoding of paired PDSCH data.
After the selected code collection that prelists, base station is using in the CDD precoding two ways of random wave bundle figuration or wave beam forming A kind of pre-coding matrix that the precoding concentration is recycled according to PRB carries out precoding, wherein random wave to PDSCH data Beam figuration is also referred to as the random wave bundle figuration of semi-loop.
To first carrying out resource allocation by the PDSCH data after precoding, OFDM modulation, last basis are carried out again afterwards The precoding goes out PDSCH transmission by corresponding antenna port.
Step S208：Precoding is carried out to DMRS sequences according to the pre-coding matrix on current PRB.
Corresponding precoding is carried out to DMRS and is used for UE progress channel estimations and data receiver.On the current PRB of basis Pre-coding matrix to DMRS sequences carry out precoding, including：The RI information reported according to UE, select DMRS port, generation pair Answer the reference signal sequence of port；The precoding square reference signal sequence of each DMRS port being multiplied by respectively on current PRB Battle array.
Base station determines the precoding to PDSCH, it is also desirable to corresponding precoding is carried out to DMRS and is used for UE progress channels Estimation.The RI information that base station reports according to UE, select descending DMRS port 7,8 ..., 6+l (l is the number of plies), and generate corresponding end The reference signal sequence of mouth.And it is multiplied by the pre-coding matrix that current PRB is used respectively to the sequence of each DMRS port and completes pair The precoding of DMRS sequences.
Step S207 and step S208 is coordination, as a preferred embodiment, can first carry out step S207 performs step S208 again.
When UE is in high-speed mobile scene, due to the influence of Doppler, PMI information that UE is reported exactly and can not be worked as Preceding channel is matched, if directly using pre-coding matrix corresponding to PMI to carry out precoding, will necessarily reduce systematic function.Cause This reports information according to mobile context configuration UE's, the available code collection that prelists of one group of information structuring is reported according to described, according to PRB Recycle the pre-coding matrix that the precoding is concentrated and precoding is carried out to PDSCH data, given for different mobile contexts Go out the different flexibilities for reporting information and corresponding method for precoding, enhancing precoding, enhance systematic function.
The embodiment of the present invention gives different open loops or the precoding of semi-loop for different mobile contexts, enhances The flexibility of precoding, and the precoding mode based on DMRS is employed, the transmission of higher, Er Qieke can not only be supported To carry out more accurate and finer precoding, the performance of open loop transmission system further enhancing.
It is a kind of embodiment of the descending multiple antennas pre-coding system provided in the specific embodiment of the invention below, system Embodiment of the embodiment based on above-mentioned method realize, not most description in systems, refer to the embodiment of preceding method.
Fig. 3 is refer to, it is a kind of reality of the descending multiple antennas pre-coding system provided in the specific embodiment of the invention Apply the block diagram of example.As illustrated, the system, including：
Report information collocation module 31, information is reported for the mobile context configuration UE according to residing for UE.
The code collection that prelists constructing module 32, for reporting one group of code collection that prelists of information structuring according to.
Precoding module 33, for recycling the pre-coding matrix of the precoding concentration according to PRB to PDSCH data Carry out precoding；Precoding is carried out to DMRS sequences according to the pre-coding matrix on current PRB.
Preferably, described to report information collocation module 31 to be specifically used for, if UE is in middle low speed mobile context, configuration UE is same When report CQI information, CRI information, broadband PMI information and RI information, do not feed back subband PMI information.It is corresponding, the precoding Collection constructing module 32 is specifically used for, one group of CRI information, broadband PMI information and RI the information structurings code collection that prelists reported according to UE.
The code collection constructing module 32 that prelists, is specifically used for：
When base station configuration UE uses Release 12 8 antenna codebook, definitionN=0,1,2,3, represent not The phase adjustment factor between same polarization directional aerial；Define vm=[1 ej2πm/32 ej4πm/32 ej6πm/32], m=0,1,2 ..., 31, represent 32 basic precoding vectors；
As RI=1, the parameter in the broadband PMI information that UE is reported is i1, contain up to following 16 available One pre-coding matrix：
The translational speed of mobile context and UE according to residing for UE, according to presetting principle from first pre-coding matrix Some pre-coding matrixes are selected to form the code collection that prelists；Or
As RI=2, the parameter in the broadband PMI information that UE is reported is i1, contain up to following 16 available second Pre-coding matrix：
The translational speed of mobile context and UE according to residing for UE, according to presetting principle from second pre-coding matrix Some pre-coding matrixes are selected to form the code collection that prelists；
Wherein W represents pre-coding matrix；G represents same beam selection, the precoding group of out of phase Dynamic gene.
Similarly, when RI is other numerical value, according to the parameter in the broadband PMI information, obtain to use corresponding to it The second pre-coding matrix, the translational speed of mobile context and UE of the base station according to residing for UE is corresponding from it according to presetting principle Available second pre-coding matrix in select some pre-coding matrixes composition to prelist code collection.
Preferably, it is described to report information collocation module 31 to be specifically used for, if UE is in high speed mobile context, configure on UE CQI information, CRI information and RI information are reported, does not feed back PMI information.The corresponding code collection constructing module 32 that prelists is specifically used for, The one group of code collection that prelists of CRI information and RI information structurings reported according to UE.
The code collection constructing module 32 that prelists, is specifically used for：
When base station configuration UE uses 8 antenna codebook in Release 12,
If RI=1, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,OrOrOr
If RI=2, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,Or Or
Wherein, W represents pre-coding matrix.
Similarly, when RI is other numerical value, the DFT pre-coding matrix groups of 8 standards are selected from 8 antenna codebook Into the corresponding code collection that prelists.As RI=1, if system bandwidth is smaller, such as 1.4MHz situation, can be from the DFT of 8 standards Interval 4 conducts of selection prelist code collection in pre-coding matrix, such asOr
Preferably, it is described to report information collocation module 31 to be specifically used for, if UE is in the high-speed mobile along radius of society Scene, configuration UE report CQI information and RI information.Corresponding, the code collection constructing module 32 that prelists is specifically used for, according on UE The RI information of report is each one group of code collection that prelists of CRI information configurations.
The code collection constructing module 32 that prelists, is specifically used for：
According to mobile context residing for UE and antenna configuration, a CSI for including K CSI-RS is configured for each UE Process, it is corresponding to include K CRI information, and precoding corresponding to each CRI information is concentrated and includes N number of precoding；
In the resource dispatched for the UE, the code collection that prelisted corresponding to K CRI information is used according to by subframe in time domain.
The construction of the code collection that prelists in each CRI, including：
When base station configuration UE uses 8 antenna codebook in Release 12,
If RI=1, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,OrOr Or
If RI=2, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,OrOr
Wherein, W represents pre-coding matrix.
Similarly, when RI is other numerical value, the DFT pre-coding matrix groups of 8 standards are selected from 8 antenna codebook Into the corresponding code collection that prelists.As RI=1, if system bandwidth is smaller, such as 1.4MHz situation, can be from the DFT of 8 standards Interval 4 conducts of selection prelist code collection in pre-coding matrix, such asOr
The pre-coding matrix that the precoding module recycles the precoding concentration according to PRB enters to PDSCH data The mode of row precoding, including：The CDD precodings of random wave bundle waveform or wave beam forming.
The random wave bundle figuration, including：The precoding is concentrated according to PRB circulations on the PRB dispatched for UE The data vector of pre-coding matrix and layer mapping output is multiplied precoding of the completion to PDSCH data.
The CDD precodings of the wave beam forming, including：
A1, the data symbol after being mapped according to the RI that UE is reported modulation carry out layer mapping；
A2, with l × l DFT unitary matrice UlData vector after being mapped with layer is multiplied, and the number of plies is l DFT tenth of the twelve Earthly Branches squares Battle array UlExpression formula it is as follows, l be equal to reporting of user RI：
A3, utilize a l × l diagonal circulation delay matrix DlIt is multiplied with the data vector of step a2 outputs, circulation is prolonged When matrix DlExpression formula be：
Wherein, i=0,1 ..., M-1, M represent the data symbol number transmitted on each antenna port；
A4, the data vector that the pre-coding matrix concentrated according to PRB recycling precodings exports with step a3 are mutually multiplied The precoding of paired PDSCH data, wherein random wave bundle figuration are also referred to as the random wave bundle figuration of semi-loop.
Preferably, the pre-coding matrix on the current PRB of the basis carries out precoding to DMRS sequences, including：
The RI information reported according to UE, DMRS port is selected, generate the reference signal sequence of corresponding ports；
The reference signal sequence of each DMRS port is multiplied by the pre-coding matrix on current PRB respectively.
Base station is determined after precoding to PDSCH, it is necessary to which carry out corresponding precoding to DMRS carries out letter for UE Road estimates and data receiver.The RI information that base station reports according to UE, select descending DMRS port 7,8 ..., 6+l (l is the number of plies), And generate the reference signal sequence of corresponding ports.And prelisting for current PRB uses is multiplied by respectively to the sequence of each DMRS port Code matrix completes the precoding to DMRS sequences.
In summary, the descending multiple antennas pre-coding system of the present embodiment offer gives different for different mobile contexts Open loop or the precoding of semi-loop, enhance the flexibility of precoding, and employ the precoding mode based on DMRS, root Precoding is carried out to DMRS sequences according to the pre-coding matrix on current PRB, can not only support the transmission of higher, and can be with More accurate and finer precoding is carried out, further enhancing the performance of open loop transmission system.
The technical principle of the present invention is described above in association with specific embodiment.These descriptions are intended merely to explain the present invention's Principle, and limiting the scope of the invention can not be construed in any way.Based on explanation herein, the technology of this area Personnel would not require any inventive effort the other embodiments that can associate the present invention, and these modes are fallen within Within protection scope of the present invention.

Claims (18)

  1. A kind of 1. descending multiple antennas method for precoding, it is characterised in that including：
    Mobile context configuration UE's reports information according to residing for UE；
    One group of code collection that prelists of information structuring is reported according to described；
    The pre-coding matrix that the precoding concentration is recycled according to PRB carries out precoding to PDSCH data；According to current Pre-coding matrix on PRB carries out precoding to DMRS sequences.
  2. A kind of 2. descending multiple antennas method for precoding according to claim 1, it is characterised in that：
    The mobile context according to residing for UE configures the UE information that reports, including：If UE is in middle low speed mobile context, UE is configured CQI information, CRI information, broadband PMI information and RI information are reported simultaneously, does not feed back subband PMI information；
    One group of code collection that prelists of information structuring is reported described in the basis, including：CRI information, the broadband PMI information reported according to UE With one group of code collection that prelists of RI information structurings.
  3. A kind of 3. descending multiple antennas method for precoding according to claim 1, it is characterised in that：
    The mobile context according to residing for UE configures the UE information that reports, including：If UE is in high speed mobile context, UE is configured CQI information, CRI information and RI information are reported, does not feed back PMI information；
    One group of code collection that prelists of information structuring is reported described in the basis, including：According to the UE CRI information reported and RI information structurings One group of code collection that prelists.
  4. A kind of 4. descending multiple antennas method for precoding according to claim 1, it is characterised in that：
    The mobile context according to residing for UE configures the UE information that reports, including：If UE is in along the high speed of radius of society and moved Dynamic scene, configuration UE report CQI information and RI information；
    One group of code collection that prelists of information structuring is reported described in the basis, including：The RI information reported according to UE is each CRI information Configure one group of code collection that prelists.
  5. 5. a kind of descending multiple antennas method for precoding according to claim 2, it is characterised in that described to be reported according to UE One group of CRI information, broadband PMI information and RI information structurings code collection that prelists, including：
    When base station configuration UE uses Release 12 8 antenna codebook, definitionRepresent not homopolarity Change the phase adjustment factor between directional aerial；Define vm=[1 ej2πm/32 ej4πm/32 ej6πm/32], m=0,1,2 ..., 31, Represent 32 basic precoding vectors；
    As RI=1, the parameter in the broadband PMI information that UE is reported is i1, contain up to following 16 available first and prelist Code matrix：
    The translational speed of mobile context and UE of the base station according to residing for UE, according to presetting principle from first pre-coding matrix Some pre-coding matrixes are selected to form the code collection that prelists；Or
    As RI=2, the parameter in the broadband PMI information that UE is reported is i1, contain up to following 16 available second precodings Matrix：
    The translational speed of mobile context and UE of the base station according to residing for UE, according to presetting principle from second pre-coding matrix Some pre-coding matrixes are selected to form the code collection that prelists；
    Wherein W represents pre-coding matrix；G represents same beam selection, the precoding group of out of phase Dynamic gene.
  6. 6. a kind of descending multiple antennas method for precoding according to claim 3, it is characterised in that described to be reported according to UE One group of code collection that prelists of CRI information and RI information structurings, including：
    When base station configuration UE uses 8 antenna codebook in Release 12,
    If RI=1, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,OrOr Or
    If RI=2, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,Or Or
    Wherein, W represents pre-coding matrix.
  7. A kind of 7. descending multiple antennas method for precoding according to claim 4, it is characterised in that：
    The RI information reported according to UE is each one group of code collection that prelists of CRI information configurations, including：
    According to mobile context residing for UE and antenna configuration, a CSI for including K CSI-RS is configured for each UE Process, it is corresponding to include K CRI information, and precoding corresponding to each CRI information is concentrated and includes N number of precoding；
    In the resource dispatched for the UE, the code collection that prelisted corresponding to K CRI is used according to by subframe in time domain；
    The construction of the code collection that prelists in each CRI, including：
    When base station configuration UE uses 8 antenna codebook in Release 12,
    If RI=1, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,OrOrOr
    If RI=2, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,Or Or
    Wherein, W represents pre-coding matrix.
  8. 8. a kind of descending multiple antennas method for precoding according to claim 2 to 4 any one, it is characterised in that described In the way of the pre-coding matrix that the PRB recyclings precoding is concentrated carries out precoding to PDSCH data, including：With The CDD precodings of machine wave beam waveform or wave beam forming；
    The random wave bundle figuration, including：Circulate according to PRB on the PRB dispatched for UE and prelisted what the precoding was concentrated The data vector of code matrix and layer mapping output is multiplied precoding of the completion to PDSCH data；
    The CDD precodings of the wave beam forming, including：
    A1, the data symbol after being mapped according to the RI that UE is reported modulation carry out layer mapping；
    A2, with l × l DFT unitary matrice UlData vector after being mapped with layer is multiplied, and the number of plies is l DFT unitary matrice Ul Expression formula it is as follows, l be equal to reporting of user RI:
    A3, utilize a l × l diagonal circulation delay matrix DlIt is multiplied with the data vector of step a2 outputs, circulates delay matrix DlExpression formula be：
    Wherein, i=0,1 ..., M-1, M represent the data symbol number transmitted on each antenna port；
    A4, recycle the pre-coding matrix that precoding concentrates according to PRB and be multiplied with the step a3 data vectors exported and complete pair The precoding of PDSCH data.
  9. A kind of 9. descending multiple antennas method for precoding according to claim 1, it is characterised in that the current PRB of basis On pre-coding matrix to DMRS sequences carry out precoding, including：
    The RI information reported according to UE, DMRS port is selected, generate the reference signal sequence of corresponding ports；
    The reference signal sequence of each DMRS port is multiplied by the pre-coding matrix on current PRB respectively.
  10. A kind of 10. descending multiple antennas pre-coding system, it is characterised in that including：
    Information collocation module is reported, information is reported for the mobile context configuration UE according to residing for UE；
    The code collection that prelists constructing module, for reporting one group of code collection that prelists of information structuring according to；
    Precoding module, the pre-coding matrix for recycling the precoding concentration according to PRB carry out pre- to PDSCH data Coding；Precoding is carried out to DMRS sequences according to the pre-coding matrix on current PRB.
  11. A kind of 11. descending multiple antennas pre-coding system according to claim 10, it is characterised in that：
    Described to report information collocation module to be specifically used for, if UE is in middle low speed mobile context, configuration UE reports CQI to believe simultaneously Breath, CRI information, broadband PMI information and RI information, do not feed back subband PMI information；
    The code collection constructing module that prelists is specifically used for, CRI information, broadband PMI information and the RI information structurings reported according to UE One group of code collection that prelists.
  12. A kind of 12. descending multiple antennas pre-coding system according to claim 10, it is characterised in that：
    Described to report information collocation module to be specifically used for, if UE is in high speed mobile context, configuration UE reports CQI information, CRI Information and RI information, do not feed back PMI information；
    The code collection constructing module that prelists is specifically used for, the one group of code collection that prelists of CRI information and RI information structurings reported according to UE.
  13. A kind of 13. descending multiple antennas pre-coding system according to claim 10, it is characterised in that：
    It is described to report information collocation module to be specifically used for, if UE is in the high-speed mobile scene along radius of society, configure on UE Report CQI information and RI information；
    The code collection constructing module that prelists is specifically used for, and the RI information reported according to UE is that each one group of CRI information configurations prelist Code collection.
  14. A kind of 14. descending multiple antennas pre-coding system according to claim 11, it is characterised in that the code collection structure that prelists Modeling block, is specifically used for：
    When base station configuration UE uses Release 12 8 antenna codebook, definitionRepresent not homopolarity Change the phase adjustment factor between directional aerial；Define vm=[1 ej2πm/32 ej4πm/32 ej6πm/32], m=0,1,2 ..., 31, Represent 32 basic precoding vectors；
    As RI=1, the parameter in the broadband PMI information that UE is reported is i1, contain up to following 16 available first and prelist Code matrix：
    The translational speed of mobile context and UE according to residing for UE, selected according to presetting principle from first pre-coding matrix Some pre-coding matrixes form the code collection that prelists；Or
    As RI=2, the parameter in the broadband PMI information that UE is reported is i1, contain up to following 16 available second precodings Matrix：
    The translational speed of mobile context and UE according to residing for UE, selected according to presetting principle from second pre-coding matrix Some pre-coding matrixes form the code collection that prelists；
    Wherein W represents pre-coding matrix；G represents same beam selection, the precoding group of out of phase Dynamic gene.
  15. A kind of 15. descending multiple antennas pre-coding system according to claim 12, it is characterised in that the code collection structure that prelists Modeling block, is specifically used for：
    When base station configuration UE uses 8 antenna codebook in Release 12,
    If RI=1, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,OrOr Or
    If RI=2, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,OrOr
    Wherein, W represents pre-coding matrix.
  16. A kind of 16. descending multiple antennas pre-coding system according to claim 13, it is characterised in that：
    The code collection constructing module that prelists, is specifically used for：
    According to mobile context residing for UE and antenna configuration, a CSI for including K CSI-RS is configured for each UE Process, it is corresponding to include K CRI information, and precoding corresponding to each CRI information is concentrated and includes N number of precoding；
    In the resource dispatched for the UE, the code collection that prelisted corresponding to K CRI information is used according to by subframe in time domain；
    The construction of the code collection that prelists in each CRI, including：
    When base station configuration UE uses 8 antenna codebook in Release 12,
    If RI=1, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,OrOr Or
    If RI=2, the DFT pre-coding matrixes of 8 standards are selected to form the code collection that prelists from 8 antenna codebook, i.e.,OrOr
    Wherein, W represents pre-coding matrix.
  17. A kind of 17. descending multiple antennas method for precoding according to claim 11 to 13 any one, it is characterised in that institute State precoding module and recycle the pre-coding matrix of the precoding concentration to the progress precoding of PDSCH data according to PRB Mode, including：The CDD precodings of random wave bundle waveform or wave beam forming；
    The random wave bundle figuration, including：Circulate according to PRB on the PRB dispatched for UE and prelisted what the precoding was concentrated The data vector of code matrix and layer mapping output is multiplied precoding of the completion to PDSCH data；
    The CDD precodings of the wave beam forming, including：
    A1, the data symbol after being mapped according to the RI that UE is reported modulation carry out layer mapping；
    A2, with l × l DFT unitary matrice UlData vector after being mapped with layer is multiplied, and the number of plies is l DFT unitary matrice Ul Expression formula it is as follows, l be equal to reporting of user RI：
    A3, utilize a l × l diagonal circulation delay matrix DlIt is multiplied with the data vector of step a2 outputs, circulates delay matrix DlExpression formula be：
    Wherein, i=0,1 ..., M-1, M represent the data symbol number transmitted on each antenna port；
    A4, recycle the pre-coding matrix that precoding concentrates according to PRB and be multiplied with the step a3 data vectors exported and complete pair The precoding of PDSCH data.
  18. 18. a kind of descending multiple antennas pre-coding system according to claim 13, it is characterised in that the basis is current Pre-coding matrix on PRB carries out precoding to DMRS sequences, including：
    The RI information reported according to UE, DMRS port is selected, generate the reference signal sequence of corresponding ports；
    The reference signal sequence of each DMRS port is multiplied by the pre-coding matrix on current PRB respectively.
CN201610333129.3A 2016-05-19 2016-05-19 A kind of descending multiple antennas method for precoding and system Withdrawn CN107404342A (en)

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